Hi akh,
While I can't tell from the pic you posted if those are indeed eggs, your description of their situation and of the parents(?) behavior (the male is the primary defender) is consistent with damsels.
The problem really isn't in getting the eggs to hatch (4-7 days for many species), but in sustaining the larval young --which in nature would lead a pelagic existence, drifting in the water and living off of smaller plankton and nekton. In hobbyist aquaria, larvae often just get chewed up by the pumps or else starve for lack of appropriate food items.
Don't worry, though --at least your damsels are healthy and comfortable enough to actually breed. They will likely keep on breeding, if you resist the urge to dramatically change the very environment that suits them so well.
You might want to check the Breeder's Registry, online, to see if they have any info on Chrysiptera husbandry, propagation and rearing..
Good luck.
horge
